I would take that stance (potentially) if aliens like the Rachni weren't infinitely better suited for that role than the Krogan though.
An alien species that is (roughly) on par with the Krogan in terms of strength and combat capability. Who's newborn can reach maturity (and combat readiness) in a matter of days as opposed to years. Come equipped with their own natural weapons and armor on par with modern technology. Are capable of surviving extremely diverse and harsh environments without the need for pressurized suits or oxygen. Each have a natural QEC built into their biology, eliminating the need for easily disrupted relay network communications. Natural engineers that can operate and help construct highly advanced technology (like the Crucible) in addition to their impressive martial prowess. And willing to come to the aid of the galaxy, no questions asked or concessions demanded for "past wrongs".
Highly organized and disciplined troops, that can serve other battlefield roles in addition to being front-line troops, that mature rapidly and have natural protections and weapons that would allow them to engage Reaper ground forces without the need for mass produced weapons and armor, and are willing to help in the fight without holding the rest of the galaxy hostage until their demands are met > Hyper violent battle toads with a massive chip on their shoulders (IMO).
I never said that the Rachni were not suitable... and I also, indeed, often rescue the Rachni Queen for the same purpose. However, I do believe that the Rachni form of "government" is very much a top-down sort of government... the only voice we hear of the Rachni "people" is that of a single queen. I believe that the most fierest fighters are ones who fight for their own reasons and causes fostered by a society that encourages a variety of opinions on issues rather than one that forcesably molds individuals into a "single- minded" society. It seems to me that, in the game, this sort of "diversity of thought" within a society is most represented by the Krogans. I don't think they are merely the dumb brutes that people here seem to catagorize them as. Yes, they overpopulated their world and destroyed it as a result... but isn't humanity doing the same thing to Earth right now? Within the discourse presented through Eve and Wrex, I think the Krogan do not intend to make the same mistakes with their society again and would formidable allies for humans and the other council races in the Andromeda Galaxy when the game moves there.





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